week1

Introduction to constructing materials:Strength: strong or weakStiffness:stiff ,flexible,stretchy,or floppyShape:mono-dimensional（linear),bi-dimensional(planar)or tridimensionalMaterial behaviors isotropic or anisotropicEconomy how expensive?what impact? Or environment? How far?Sustainability :how efficiently

ForceAny influence that produces a change in the shape or movement of a body(both magnitude and direction,represent by an arrow)

Basic structure forcesTension forcesTension forces stretch and elongate the material

Compression forcesThe opposite effect of a tension force

Compression forces result in the shortening of the material

Structural system:be designed and constructed to support an transmit applied gravityand lateral loads safety to the ground exceeding the allowable stresses in its members.

Enclosure system:shell or envelope of a building, consisting of the roof exteriorwalls,windows and doors.

Mechanical system:building provide essential services to buildingWater system,sewage system eletrical system

Load path diagram

Why do we use scales?(quiz question)To represent larger elements in smaller formatTo represent smaller element in a larger formatFor practical reasons

Knowledge map

Tutorial activities

Our group decided to build the tower in the shape of circle because for stabilityThe process of building are as above

We have leave a number of hoes with the tower that they are doors and windowsrespectively. Our tower is the most tallest one among the class.i think the reason isthat ours structure is quite stable. In the process that one of the other group’s towerfell down,theirs are built in the square bottom shape. When on e or more brick nearthe corner move, the tower are no longer stable. The construction system is structuralsystem because it is designed and constructed to support and transmit applied gravityand lateral loads safety to the ground exceeding the allowable stresses in its members.We have had difficulties when me made the doorI think we can build higher than this but there are materials limited. The material iswood that is not very heavy and smooth. I don’t know how tall can it holds that it hasa few holes, i guess that when it reach to a particular point, the wood on the bottomespecially the wood nearby the door and the window will fall down . After wefinishing the task , we began to test its stability that we use another wood to hit it .Thetower did not fall down. Then wen take some of the wood bricks out.we take thebricks from different locations,some from the top ,the bottom ,even some near theholes. The tower fall down when i was taking one brick near its window. I think it is

because the bottom are very stable but the middle part of that are the keys that thehole can not be hold on when i take ou the brick beside.

Week 2Structural joint:Roller joints allow to slide and rotatePin joints allow to rotate , not allow to slideFixed joints in all direction

FrameLoad,roof, floor

StabilityStability is that when all the forces acted on the sturcture have a zero algebraic sum

ColumnColumns are rigid,relatively slender structural members designed primary to supportaxial compressive loads applied to the ends of members

LoadsDynamic ,static

Knowledge map

On the lecture , we do the water tank test. It is a test about the mass that the structurecan afford.

It can be seen from the lecture that the weight which the pins can afford the bowl ismuch more for the right one. Although the material for both of the bowls and pins arenot stable which is pretty flexible, we can find the strong mass can be hold for theshorter structure.

And the load path diagram are as the arrows indicate which to the ground.

Tutorial activitiesOur group use a unique structure other than the other groups.We think the triangle is more stable.

For this pattern we can reach a height that it make take long time for the group whichuse the square structure:

The material is very light and flexible. First, our group cut the material into 20pieces.We thought that if we built it into a squre bottom, it may cost a lot of material that cannot reach the height. We plan to built it like pyramid ways and add some additionalbeams in order to make it stable at the last.the load path are as following :

And the photos:

Out tower is not stable at the bottom in fact that i think it need more beams andmaybe rebuild it into a square bottom will help a lot